Clough, A. R. and Edwards, R. S. (Rachel S.) (2014) Scanning laser source Lamb wave enhancements for defect characterisation. NDT & E International, Volume 62 . pp. 99-105. doi:10.1016/j.ndteint.2013.11.008

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Abstract

Surface-breaking defects in thin storage structures can cause costly component failure if left undetected. Here, a method for detecting and characterising surface breaking defects using near-field Lamb wave enhancements is presented for measurements in which a laser generation source passes over the defect. A dual laser scanning system is used to generate and detect Lamb waves in aluminium plates containing v-shaped laser micro-machined slots of different depths. Time–frequency analysis techniques are used to identify and track the magnitudes of individual wave-modes across a scan at different frequencies, and large enhancements in signal magnitude at certain frequencies are observed for the fundamental A0 and S0 wave modes when the laser source passes over the defect lip. The mechanisms responsible for this enhancement are identified and examined, and a characterisation process for identifying the position and severity of the defect is presented.

Item Type:	Journal Article
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	NDT & E International
Publisher:	Elsevier Sci Ltd.
ISSN:	0963-8695
Official Date:	2014
Dates:	Date Event 2014 Published
Volume:	Volume 62
Page Range:	pp. 99-105
DOI:	10.1016/j.ndteint.2013.11.008
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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